This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS63051: Best buck-boost converter for my project

Part Number: TPS63051
Other Parts Discussed in Thread: TPS63001, TPS63031, , TPS63805, LP2985

Hi!

I'm working on a project with a lipo battery. The battery works in a range of 2.9 to 4.2 V, but the system should be feed with 3.3 V.

From my search, I found that the component that best suits my issue is a buck-boost converter. Since the output voltage must be 3.3 V and the current is 40 - 60 mA, what component do you think is best for my project, TPS63051, TPS63001 or TPS63031. I'm focus on high efficiency rather than cost or size. I've read all the literature but I can't understand which one is better for my needs.

Thank you.

  • Hi Marcelino,

    you have narrowed down the selection to the right devices. Out of the three TPS63051 has highest efficiency.
    In order to keep the efficiency high it is important to use an inductor with low DCR.

    The TPS63051 also offers adjustable softstart and inrush current limit.

    Another device which could be interesting is TPS63805. It has similar high efficiency compared to TPS63051, but with external feedback divider.

    Are there other requirements that need to be considered?

    regards,
    Julian
  • Hi!

    I had already considered TPS63805 but I discarded it because it's on preview stage and it's not available to purchase. Should I consider it?

    The other requirement is need it's the power consumption of the converter itself has to be the mininum possible. I see that TPS63805 is better than TPS63051 in this term, but since it's not already available...

    Currently our board uses a LP2985a-33 to power the system and I'm not happy with it, because when the battery it's below 3.5 V the output it's not 3.3 V. Maybe it's a stupid question, but the TPS63051 is far better than this in terms of efficiency, isn't it? I mean, does the battery last longer?

    Thank you very much!
  • Hi Marcelino,

    TPS63805 is planned to release this month. Samples and EVMs are available now.

    The TPS63xxx buck-boost devices are made for the purpose to provide a regulated output voltage when VIN range is around VOUT. So your application the buck-boost device can help to lengthen the lifetime as it will be able to operate down to 2.9V.

    TPS63805 offers lower quiescent current compared to TPS63051.
    in case it is possible: If the output voltage does not need to be available all time, using the EN pin will help to lower the current consumption even more (see shutdown current, typ 100nA).

    regards,
    Julian
  • Then, I think that TPS63805 is right device for my project.

    Currently, our device uses LP2985a-33 to power the system, do you think that the battery of our device will be lenghtened the lifetime if we use the TPS63805 instead of LP2985?

    Thank you very much.
  • Hello Marcelino,

    Most probable you will be able to extend battery life because you now can go to a lower discharge voltage than with an LDO and in addition you do not have full load current on the battery as long as the battery voltage is above the output voltage.

    TPS63805 seems to be the right part for your system.

    Best regards,
    Brigitte
  • Thank you so much, TPS63805 will be my choice.

    Have a nice day!